Bioacoustics of Cryptachaea pacoti

Description . Male ( Holotype ; IBSP 345148). Carapace dark gray, with black thoracic groove. Chelicerae orange, with two teeth in promargin ( Fig. 3A ) and one tooth in retromargin. Labium and endites yellow. Sternum yellow, with gray borders. Legs orange, except thighs, trochanters and base of femora cream. Abdomen, dorsal view, gray, with black bands on the lateral and posterior edge, and dorsally with several scattered white guanine spots ( Fig. 1A ). Ventrally black, with two white guanine spots on the posterior side. Abdomen oval, with very small stridulatory organs. AME slightly larger than the other eyes, separated from each other by its diameter, and closer to the ALE. PME separated from each other by almost its diameter, just like PME. ALE and PLE almost together. Measurements. Total length 2.2. Carapace: length 1.1, width (larger width) 0.9. Abdomen length 1.1, width 0.7, high 0.6. Legs, formula 1423, length I/II/III/IV: femora 1.8/1.1/0.7/1.4; patellae 0.5/0.4/0.3/0.4; tibiae 1.7/0.75/0.5/0.75; metatarsi 1.3/0.8/0.6/0.9; tarsi 0.6/0.45/0.5/0.4. Total legs length: 5.9/3.5/2.6/3.85. Palp ( Figs. 1C–D ; 3C–F ; 5A ): tegulum enlarged, with short spermatic duct; elongated and hyaline conductor, close to the distal area of the embolus; rectangular embolus. Female (IBSP 345158). Carapace dark gray, but can vary to light brown ( Fig. 2A–C ), with a lighter posterior dorsal edge. Chelicerae orange, with two teeth in promargin ( Fig. 4A ). Labium and endites yellowish gray. Sternum yellow with brown edges.Yellowish legs with gray distal area of the joints.Abdomen, dorsal view, varying from dark gray to light brown, but with medial-longitudinal-lateral cream band, with enlarged colulus ( Fig. 4D ). Ventral view gray. Abdomen spherical, with stridulatory organs as in male. Eyes as in male, except ALE and PLE separated from each other by about two-thirds of an eye’s diameter. Epigynum ( Figs. 2D , 4C , 5B _D): epigynal plate with concave lateral edges and slightly grooved posterior edge; parallel and short copulatory ducts, between the spermathecae; spermathecae globose; fertilization ducts short, originate at the internal base of the spermatheca. Measurements. Total length 2.6. Carapace: length 1.3, width (larger width) 1.8. Abdomen length 2.0, width 1.8, high 1.9. Legs, formula 1423, length I/II/III/IV: femora 2.1/1.1/0.75/1.8; patellae 0.6/0.5/0.4/0.5; tibiae 1.4/0.8/0.5/0.55; metatarsi 1.5/0.9/0.65/1.1; tarsi 0.75/0.5/0.5/0.55. Total legs length: 6.35/3.8/2.8/4.5. Variation. Among females, at least three shades of color were observed on the abdomen ( Fig. 2A–C ). Two colors are more common among populations, the dark form and the lighter one. Some specimens have intermediate coloring, but this is represented in only 20% of the specimens sampled. Males varied little in coloration, and the majority of specimens followed the dark pattern ( Fig. 1A ). Measurements: males (n = 10) - total length 1.8–2.0; carapace 1–1.1; femur I 1.5–2.0; females (n = 10) - total length 2.8–3.3; carapace 1.2–1.45; femur I 1.6–2.2.